[HttpClient] fix parsing response headers in CurlResponse #37486
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This fixes rare notices that look like:
Argument 2 passed to Symfony\Component\HttpClient\Chunk\DataChunk::__construct() must be of the type string, null given
I'm unable to provide a test case since I'm unable to provide a simple reproducer.
It happens that curl can call the header-function with multiple lines at once apparently, while most of the time it does so with one at a time.